parameterise img_coders so centos_42x can has thumbs
parameterise img_coders so centos_42x can has thumbs

marsbard/puppet-alfresco,digcat/puppet-alfresco,marsbard/puppet-alfresco,marsbard/puppet-alfresco,marsbard/puppet-alfresco,digcat/puppet-alfresco,digcat/puppet-alfresco,marsbard/puppet-alfresco,digcat/puppet-alfresco,digcat/puppet-alfresco